Add enum entries for the maximum valid metadata values

Fixes #346 (closed).

changed milestone to %0.8.0

added sanitizer label

The Dav1dChromaSamplePosition entry isn't strictly required since the range is defined in terms of bits required to represent the value and not the value itself, and as such 3 is valid when the maximum defined entry is 2. Should we still keep it?

I've locally confirmed that this patch avoids the UBsan error we discovered in https://bugzilla.mozilla.org/show_bug.cgi?id=1649862. Thanks for the quick turnaround!

added 2 commits

• 1b9792f3 - 1 commit from branch videolan:master
• d69fc655 - Add enum entries for the maximum valid metadata values

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resolved all threads

merged